Needle roller bearings with cylindrical roller bearings, relative to its diameter, roller both thin and long. This needle roller called. Despite having a smaller cross-section, bearing still has a higher load bearing capacity, and therefore particularly suitable for radial space is limited occasions.Needle contour surface at the proximal surface shrink slightly.Needle Roller and raceway line contact amended to avoid produce destructive edge stress. Supporting the department of thick-walled outer ring of needle roller bearings, high temperature high nitrogen quenching, high precision separation roller is guided by the high rigidity of the outer ring of ribs, using linear contact wheel can raceway easily turn and can under enormous loads. To remove the stress, the support of the outer ring of the wheel arc design, curve roller with single, double ring, without the ring, with the seal ring and other specifications. With seals storage grease a large space to provide long-term lubrication of lithium grease, and extended lubrication interval. Seals made of nitrile rubber with a skeleton or ST12, its operating temperature range of -30 ° C to +100 ° C or -30 ° C to +180 ° C Dense mounted curve roller can withstand heavy the strong-load and high-performance operation.Needle bearing equipped with a thin and long roller (roller diameter D ≤ 5mm, L / D ≥ 2.5, L is the length of the roller), therefore radially compact structure, the inner diameter size and load capacity and other types of bearings with the same, the smallest outside diameter, especially suitable for the radial mounting of the support results of the size restrictions.Based on the use of different occasions, can be used without the inner ring of the bearing or needle roller and cage assemblies, the match with the bearing journal surface and the surface of the shell hole as bearing directly within the outer rolling surface, in order to ensure the load capacity and operation the same performance with rings bearing shaft or housing bore raceway surface hardness, machining accuracy and surface quality bearing ring raceway is similar. Such bearings can only bear radial load.Install the full complement needle roller bearings, is usually carried out by using an auxiliary sleeve. At this time, the auxiliary roller or auxiliary sleeve boosting the needle not make the needle fell out of the journal the needle off its own chamfer, with the needle bearing in the journal on the slowly moving inward, auxiliary roller or auxiliary the sleeve will slowly exit until mounted up to the working position.Auxiliary roller, auxiliary sleeve outer diameter than the shaft diameter is small 0. 1-0. 3mm. Installation, the first bearing surface of the outer ring coated with grease, that abuts the inner surface (clearance) should be the last one needle is placed stickers put the needle, and then instead of a journal or auxiliary roller bearing inner ring or auxiliary sleeve pushed into the outer ring bore, and its end face aligned with the installation of the shaft end surface or has been mounted on the bearing inner end face of the shaft, and then hit applying pressure using a press.